Abstract
Some operational conditions, especially a rotating speed of recirculating pump, were studied for the production of salt with average particle size of 650-850 μm by using the existing reverse circulating type of evaporating crystallizer. This facility was designed for the production of common salt and has been operating since 1972 successfully. At RUN-1 test the effect of the rotating speed of the recirculating pump, and at RUN-2 test the effect of the quantity of steam to be fed to the calandria (heat exchanger) were investigated respectively. Measured data were analyzed by the Rosin-Rammler Chart and the empirical operational Design Diagram developed by Toyokura et al. The factors affecting the particle size of salt and correlations between each factor were determined. The conclusion of the investigation was that the rate of nucleation depended on the rotating speed of the recirculating pump, the degree of supersaturation of the brine and the suspended salt concentration in the evaporating crystallizer. By using these results a stable production of a large particle size salt was achieved successfully at the existing evaporating crystallizer.
